Grinding machinery



Nov.25, 1930. A. TURNER 4 @BINDING MACHINERY Filed Oct. 24, 1924 f 1 v i m-/\ lm .uw EN H 1|; -I H Il r1|| I WN l, IE. Il v I l n I llv| l|x||| u||||||h l l w :Irv I Ml hrw Xo @V i ,Ill L Ik NNWN N i K l LVW Q nu Patented Nov. 25, 1930 A UNITEDSTATES p onIo y PATENT OFFICE `g ALBERT TURNER, or CINCINNATI, oHro, AssrGNon., BY ivinsNE ASSIGNMENTS, vTo crN- CINNATI enrNnnns INCORPORATED, or QINCINNATI, omo, A eonronATIoN or GRINDING MACHINERY y Y Application filed October 24, 1924. QSerial 1\To."2115,673.V

This invention relates to improvements in that type of metal working machinery commonly known as center grinding machines i or machines in which the work `is rotatably 6X5 held between centers in operative relation to a grinding wheel for removing desired stock therefrom.

In the case of longer work pieces it has been `found desirable in' a machine of this character to mountthework on a traversing or longitudinally shiftable table and provide suitable means such as "a motor carried by the `table itself to cause the necessary rotation of the work. VIt is desirable thatsuchma-` chines be self-contained and haveno undue extraneous wiring or the like. c

` One of the purposes of the present invention, therefore, is to provide novel and improved `means for transmitting the .driving current to the motor on the reciprocable table ofthe machine.` 1 7 It is 'one of the particular objectsof the inventiontoprovide` a mechanismin which it will lie-possible to make use of a continuous unbroken electricalconductor which maybe suitably insulated, armored, and the like, and in which there are nolooseconnection's, wiping contacts, or the like. Y Thisis of particular importance in a structure such as that here under consideration,` both in view Vof the heavy4 current necessary to transmit tothe driving motor, and also to thefact that machines of this character operate with a cool* ant o-r liquidV playing in a stream upon the work and carrying abrasive particles away possibility of such abradantlin suspension in the liquidbeing carried to joints orfthe like', causing wear in the parts and interfering with proper operation thereof@V l Broadly considered, therefore, the present invention comprises mechanismwhereby an electrical conducting `member `or members form from asuitably protectedplace, as for example, within the bed of the machine to variable position motori or driving member on the machine, and'in whichsaid cable or conductor may be wound and unwound as from the work.` There istherefore always the may be carried in continuous and `unbroken desiredtoprevent any slack in same, but

without twisting thereof tending to CryStaL lize and break the conductor, and without any commutator or similar circuit makingconnections. ,i A

A further object of thel invention is the provision of an entirely enclosed and water proof mechanism which will reduce to a minimum the liability ofshort circuitii'ig .the elec-V i trical connections as by the coolantor `fluid which-it is necessary to employ on themachine during the grinding operation.

For purposes of illustration, the invention hasbeen-sliown as applied to a long ,table grinding machine such as used in the grinding of lo-ng shafts or the like,but it islto be understood that the invention is capable of application for many other purposes, and that .Fad

I may make'any modfications in the specific 'structural details shown and described withinthe scopeof the appended claims withoutV departing from or exceedingthe spirit o-f the invention. l i i Figure lisa rear-view of a machine embodying my improvements. i .i

Figure 2 is a sectional view on thelineQ-Q of Figurerll. A

Figure?) is a sectional'view `on the line 3 3 of Figure 2,

F'gure 4 is a sectional view on the line i i Y k8() l--tofFigureZ .Figure 5 isa fragmentary plan view ofthe terminal portion of the drumand its pintle parts being shown in section,and ,i

Figure 6 is a sectional view online A6--6 of Figure/5..v l f i y In the drawings the letter A designates the base or bed of a grinder of conventional construction having the grinding wheel B f and the'traversing table C adapted to move from end to end along the bed. vThistable C- carries the headstock Dy and tailstock E for supporting the work F. Secured on the table C adjacent the headstock D is the actuating 'loV motor Gr, therefore connected through suit Hable gearing with the headstock spindle forf rotationof the spindle'and thus of tliework. in `order that the machine may be free from hanging or depending wires or the like, and at the sametimemotor G `properly supplied with actuating current irrespectve of mounted upon said member 12 is the hub 14Cv of the winding drum 15. This drum has peripheral flanges 17 providing a spool to receive the flexible conduit 18 through which runs the insulated electric wires 19.

The position of the cable should be readily uneerstood by reference to Figures 2 and 3 from which it will be seen that a portion of the cable is coiled or adapted to be coiled ex teriorly on the drum between the flanges 17 while a second portion is loosely wound within the drum encircling the stud 11 of the bracket. A clamp collar 2O prevents withdrawal of this inner coil portion of the cable or conduit from the drum. The inner end of the coils is extended through the passage 21 of bracket 10 and through the side of the bed 18 into the base of the machine where lead wires may be connected to a suitable place on the machine for attachment of the actuating current leads from the power circuit.

It will thus be seen that as the cable is unwound from the outer portion of the drum as indicated by the full lines of Figure 1, the drum will rotate in a counter-clockwise direction as is indicated by the arrow. This rotation unwinding the cable from the outer spool portion of the drum will cause a winding action as respects the inner coils, tending to tighten them around the stub portion of the bracket, but without twisting or undue bending or tension on the wire tending to crystallize or break same. Similarly on reversing the clock-wise movement of the drum to wind the cable thereon, as the table is moved toward the right when the amount of cable required will be less, as indicated by the dotted lines in Figure- 1, there will be a loosening of the inner coils, which will move outward toward engagement with the interior of the drum as indicated, `for example, in Figure 3. A

To cause this winding or take-up rotation of the drum, I may make use oi. the flat helical spring 210 secured by the stud or bracket 22 at one end to the bracket member 11 and having its other end secured by the screw post 23 to the face of the drum.

t will be noted that the portions of the conduit or cable in the interior of the drum and the spring both wind in the same direction, so that the coils ot both are wound up or tightened as unwinding tension is placed on the cable 18. Similarly, when tension on cable 18 is released the spring will expand or unwind, giving a clock-wise rotation to the drum, taking up the slack of the cable and causing likewise an unwinding action of the coils.

To facilitate assembling of the parts and to secure the drum in desired position as for initial spring tension adjustment or the like, there is formed in the hub 14 a guide-way 24 in which slides the keeper 25 retained by screw 26 engaged in counter-sunk slot 27 of the keeper. This keeper may be shifted to lie entirely within slot 24 or may be axially projected therefrom into interlocking engage ment with the slot 28 of collar 29. This collar is disposed on the end ot spindle 12 exterior to hub 14 and pinned in place to retain the drum in position. lt will thus be seen that on account of pinning in position of the spindle and of the collar on the spindle, the several parts are positively held against relative rotation while the drum may be wound to desired spring tension or the like and keeper 25 then engaged in recess 28 oli' the collar when the drum itself will be locked against accidental rotation.

From the foregoing it will be seen I have provided a simple, inexpensive and durable mechanism for transmitting electric current through a winding mechanism without twisting of the wires or the use of commutators or other exposed wiping contacts which could not be found to advantage in a machine of this character.

It is to be understood that it is quite important to protect the electrical system as far as possible from the coolant or luid used in connection with the grinding operation and particularly to prevent this current from reaching any exposed parts, and also it is desirableto protect the bearings of the drum and its spring. To this end, the hollow or shell drum member 15 is provided with the closure 30, suitably secured to its open end and encircling the axle bracket 11 in wiping contact therewith to exclude coolant abrasive particles and the like as will be clearly understood by reference to Figure 2.

I claim:

1. In a device of the class described the combination of a bracket having an opening axially thereof through which a lead wire ,may pass, a stub shaft carried by the bracket,

a hollow drum rotatably supported by the stub shaft and having an opening therein through which the lead wire may pass, an electric lead wire passing axially through the bracket into the interior of the drum where it is coiled about the bracket, then passing through the opening in the drum and coiled exteriorly about the drum, and yielding means adapted to be tensioned when the lead wire is uncoiled from the exterior of the drum but coiled about the bracket interiorly of the drum, the yielding means being adapted to recoil the electric lead wire around the exterior of the drum and uncoil said wire from the bracket.

2. In a device of the class described the combination of a brackethaving an opening axially thereof through which a lead -wire may pass, astub shaft carried by the bracket,

a hollow drum having an open and a closed end rotatably supported by the stub shaft and the drum further having an opening therein i through which the lead wire may pass, an

electric lead wire passing axially through the bracket into the interior of the drum where it is coiled about the bracket, then passing through the opening in the drum and coiled exteriorly` about the drum, and means for closing the open end of the drum to exclude foreign matter from the interior of the drum.

3. In a device of the class described .the

combination of a rotatable drum, a stub shaft therefor, a bracket supporting the stub shaft and drunnan` electric lead wire loosely coiled about the bracket interiorly of the drum and tightly coiled about the drum exteriorly thereof, and means for automatically 'recoil-V ingl said lead wire after it has been uncoiled.

" l; In a device of the class described the combination of a hollow rotatable drum having an open end, a stub shaft therefor, a

bracket supporting the stub shaft and drum,

an electric lead `wire loosely coiled about the bracket interiorly of the drum and tightly coiled about the drum exteriorly thereof,

means for automaticallyrecoiling said lead wire after it has been uncoiled, and means 1 for closing the open end of the drum to exclude foreign matter from the interior of the drum.`

5. In a device of the class described the combination of a hollow drum having one end open, a support rotatably supporting the drum and having an axial opening therein,

40 a lead wire extending' through the opening into the interior of the drum vwhere it is coiled and then passing out through the drum to be coiled about the exterior thereof, means `re-siliently rotating the drum in one direc- 'tion to recoil the lead wire after it has been uncoiled, and a closure plate for the open end of the drum to exclude foreign matter therefrom., Y

6. In the device of the class described the combinationof a hollow drum mounted for rotation, a support therefor having an opening therein, a lead Wire extending through the opening into `the interior of the drum Y ,where itis coiled, then passing to the exterior 4of the drum where `it is again coiled, `and resilient means for rotating the drum inv one directionto recoil thelead wire after it has been uncoiled. y

In testimony whereof I hereunto set my G0 hand this 30th day of September, 1924, at Y y Cincinnati, Ohio. Y I Y Y ALBERT TURNER; 

